Strain-insulator.



L. STENBERGER.

STRAIN INSULATOR.

APPLlcATIoN FILED Nov. 24. 1913.

Patented N ov. 21. 1916.

LOUIS STEINBERGER, OF BROOKLYN, NEW YORK.

STRAIN -INSULAT OR.

Specification of Letters Patent.

Patented NOV. 21. 1916.

Application lcd November 24, 1913. Serial No. 802,686.

17 o all lw'wm t may concern.'

Be it known that I, Louis S'mrNBunGER, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Strain- Insulators, of which the following is a specification. j

This invention relates to strain insulator constructions such as are used for high tension currents.

The principal object of this invention is to improve the construction and efficiency of insulators of this type.

A further object is to improve the construction of the strain members so that a series of insulators of the type disclosed may be connected in chain relation without the interpositioning of special connecting members.

A further object is to provide a two-part strain member and means for connecting the parts-thereof together, and to so dispose a portion of the insulator structure as to positively indicate when the parts of the strain member are properly assembled.

Other lobjects and aims. of the. invention, more or less specific than those referred to above, will be in part obvious and in part pointed out ,in the course of the following description ofthe elements, combinations. arrangements of parts and applications of principles, constituting the invention; and the scope of protection contemplated will be indicated in the appendedvclaims.

In the accompanying drawings which are to be taken as a part ofthis specification, and in which I have shown a merely preferred form of embodiment of the invention: Figure 1 is a transverse, central, sectional view through an insulator constructed in accordance with the provisions of this invention: Fig. 2 indicates a pair of insulators constructed substantially as in Fig. l arrangedjin concatenated relation, the upper insulator unit being shown in transverse section on a plane at right angles to the plane of the section shown in Fig. 1; and Fig. Bis a bottom plan view, on a. slightly reduced scale, of the structure shown in Fig. 1.

Referring to the drawings for a detailed description o'f the structure illustrated, the

reference character L indicates generally the disk portion of the insulator. This may be of any preferred shape or design but is necessarily formed with a central or body portion l, of suiiicient bulk to receive and retain, with ample mechanical strength, the opposite strain members.

The strain members are indicated by reference characters G and H. The strain member G is of two parts as 2 and 3. The part l comprises a U-shaped metallic meniber having the greater portion of its length embedded and concealed within the material of the body portion l of the disk. The opposite ends of the legs of the U project beneath the lower surface of the body and are threaded for the attachment of the separately formed U-shapcd part 3 which cooperates with the embedded part 2 to complete therewith a closed link. The part 3 has its opposite legs disposed with their ends abutting thc projecting ends of the legs of the part 2. These legs may be connected in any approved manner but are preferably connected by the means shown, which connecting means is specifically claimed in my copending application. This connecting means consists in a threaded socket 4.- upon one leg of the part for engagement with the threads of the adjacent leg of the part 2 by bodily inter-rotation between said parts, and in a separately formed sleeve 5 engaging threads upon the other leg of the part 3, and extending into engagement with the threads of the adjacent leg of the bart Q. The sleeve is rotatable to travel along the leg of the part 8, to free itself from engagement with the threads of the part 2., so that the part 3 may be rotated bodily as suggested. The other strain member, as H, may be a two-part structure as just described for the strain member G, or it may be formed as a solid closed link as shown at the bottom of Fig. 2, according to convenience or requirements.

Strain insulators, as heretofore manufactured with closed eyes or loops and the like projecting from opposite sides thereof, have required the use of a separately formed connecting member for joining adjacent units together. By providing the strain members with means whereby the eyes or loops may be opened, as herein suggested, it is apparent that adjacent insulators maybe directly connected with each other, as shown in Fig. 2, without the provision and interposition of the separately formed connecting members. The strain members themselves fulfil the requirements and economize space and mate'- rial and greatly facilitate the work of the operator. The cost of production, consider.- ing the reduced weightof metal required,

is little if any more than the cost of suspen'v preferably formed of insulating material such as electr ose l and may be provided with any suitable form of protection parts A 1`6, as desired The several units'wliich maybe connected for completmg a chain type insulator may be of uniform size and insulatin qualities,

or they may be graded relative y to each other as suggested by the difference in diameter bet-Ween the two disks shown in Fig. 2, if desired.

It may be particularly noted. that the sleeves 5 are preferably 0f a length substantially equal to twice the length of the projecting threaded portion of the ypart 2, and that suitable bosses or projections 7 are formed upon the insulator body so astoprovide flat abutting surface for the ends of the sleeves `topositively limit the travel of the sleeves upwardly upon the threaded portions of the part 2.

8 indicates a brace formed preferably of a stiff metal, each end of which is provided with suitably formed portions to engage with the legs of the .suspension members. This brace may extend exteriorly of the insulator or may be set into the material of the insulator as shown in thelower insulator of Fig. :2. In some instances the brace may form, an integral part of the suspension members.

The upward travel of the socket 4 is limited in like manner, andby this means it is apparent that an operator is merely to adjust the socket and the sleeve until engagement isfmade with the bosses 7 when he is ment.

assur dl that the. desired accurate adjustehas been, obtained.

AS1 many. changes could b Iliade ,in the above.. desribed construction, and various embQdIIlentS of theinventioni could be made without departing from the scope thereof, it

visyintended that all matter contained in the Y above description, lor shown in the accompanying drawings, shall be interpreted as illustrative only,l and not in' a limiting sense, and that the following claims are intended to cover all the generic and specific features of the invention which may be said to fall within the language of said claims.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is: Q

1. An insulator formed of a body portion of insulating material, a member partly embedded therein and having a portion projecting from said insulating material, a member to be connected to said projecting portion, a threaded sleeve rotatably mounted on said member, said projecting portion'` being threaded to be engaged by the threads of said sleeve, and said body of insulating material having a partdisposed to b e engaged by'said sleere for limiting` the travel of sleeve along the threads of said projecting port-ion for the purpose set forth.

2. A disk type strain insulator comprising a disk of insulating material, a strain rnember enibeddedpartly within said insulating material and vhaving threaded portions proje'cting from said insulating material in spaced relation, al U -shaped memb'en disposed with its two legs arranged to .the projecting portions of said strain member, threaded lparts Acarried by eachof the legs of said U-sh'aped member for engaging'the threads vof te projectingI ortions' of said strain member, and the disk 4of insulating material being provided with parts disposed for limiting the travel o'fsai'd threaded parts upwaidly .urfm the Proietne Prtos O'f said, strain member for the purpose set forth.

3. An insulator` formed of a body of' insulating material, a member artly embedded therein having a threa edv portion projecting. beyond one surface of said bod)T of insulating material, a, second rnember to be connectedto, said projecting, portion, said second memberlhaving threads fo'rx'n'ed o'n oneend thereof, said end being adapted to be disposed in alinement with the. projecting portion Iof said embedded member, so that the threads thereof will form, a continuation of the threadof said projecting portion, a separately formed threaded 'sleeveengaging the threads of 'saidsecond member being freely movable longitudinally therealong and onto the threads of thp'rojecting. y0rtionofthe first member, and the body o insulating` material being formed with a part disposed to arrest the lonl 'itudi'nal movement of said sleeve when sai sleeve is substantially equally, in engagement'- with the threads of said first and said second members.

LA strain insulator, comprising a body portion of insulating material', a pair of strain members partly disposed within said said legs to form a closed loop, and mean body portion and insulated from each other, whereby said loop may be opened. L) one of said strain members comprising a U- In testimony whereof, I eHiX my signashaped portion having the ends of its tWo ture in the presence of two Witnesses.

25 legs extending from said insulating mate- LOUIS STEINBERGER.

rial, a strengthening member engaging the Witnesses: extending portion of the legs of said U- L. GEssFoRD HANDY, shaped portion, means engaging said ends of NATHALIE THOMPSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D C. 

